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The compressive yield stress of particle gels shows a highly nonlineardependence on the packing fraction. We have studied continuous compressionprocesses, and discussed the packing fraction dependence with the particlescale rearrangements. The 2D simulation of uniaxial compression was applied tofractal networks, and the required compressive stresses were evaluated for awide range of packing fractions that approached close packing. The compressionacts to reduce the size of the characteristic structural entities (i.e. thecorrelation length of the structure). We observed three stages of compression:(I) elastic-dominant regime; (II) single-mode plastic regime, where the networkstrengths are determined by the typical length scale and the rolling mode; and(III) multi-mode plastic regime, where sliding mode and connection breaks areimportant. We also investigated the way of losing the fractal correlation undercompression. It turns out that both fractal dimension $D_{\mathrm{f}}$ andcorrelation length $\xi$ start to change from the early stage of compression,which is different from the usual assumption in theoretical models.

Compressive consolidation of strongly aggregated particle gels